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CN-115244299-B - Refrigerant compressor

CN115244299BCN 115244299 BCN115244299 BCN 115244299BCN-115244299-B

Abstract

Refrigerant compressor (12) for a refrigeration device, comprising a motor (60), at least two cylinder groups (42) and a mechanical power control unit (70) for activating and deactivating at least one cylinder group (42) in order to activate or deactivate its refrigerant discharge, wherein the refrigerant compressor (12) is operable for operation in a plurality of partial power states in at least two different operating modes (B), wherein each operating mode sets a different activation or deactivation of a cylinder group (12) than the other operating modes, wherein the refrigerant compressor (12) is assigned a frequency converter (132) for rotational speed control of the motor (60), wherein an operating state control device (130) is assigned to the refrigerant compressor (12), which, depending on a power request signal (LA) input to the operating state control device, and for operation of the refrigerant compressor (12) in a partial power state which corresponds to the power request signal (LA), causes the refrigerant compressor (12) to be operated in a selected operating mode from the at least two different operating modes (B) and in a partial power state which is adapted to the selected rotational speed.

Inventors

  • Jens Mannowitz
  • Tobias Fuhe

Assignees

  • 比泽尔制冷设备有限公司

Dates

Publication Date
20260505
Application Date
20210210
Priority Date
20200214

Claims (20)

  1. 1. Refrigerant compressor (12) for a refrigeration device (10), comprising a motor (60), at least two cylinder groups (42) each having at least one cylinder unit (44) having at least one cylinder housing (46) and at least one piston (48) driven by the motor (60) and capable of oscillating movement, and a cylinder head (58) assigned to each cylinder group (42) having an inlet chamber (72, 162) through which an inlet flow (74) flows and an outlet chamber (88, 164) through which an outlet flow (86) flows, and a mechanical power control unit (70) for activating and deactivating at least one cylinder group (42) in order to activate or deactivate the refrigerant discharge of the cylinder group, Characterized in that the refrigerant compressor (12) is capable of operating in at least two different operating modes for operating in a plurality of partial power states, wherein each operating mode sets a different activation or deactivation of the cylinder group (42) than the other operating modes (B), the refrigerant compressor (12) is assigned a frequency converter (132) for rotational speed control of the motor (60), the refrigerant compressor (12) is assigned an operating state control device (130), the partial power states to be achieved are divided into a threshold value (PHG) and a partial power state (PHG) which is greater than the threshold value (PHG) and the electric power consumption of the motor (60) is selected and the higher power state (PHG) is required and the higher power state (PHG) is selected and the higher power state (PHB) is higher than the threshold value (PHB) in order to determine the relative efficiency or COP of the operating modes, and in partial power states below the threshold value (PHG) and in operating modes at lower rotational speeds of the necessary electric machine (60), a higher relative efficiency or a higher COP or a lower electric power consumption is accepted and these operating modes are selected accordingly.
  2. 2. Refrigerant compressor according to claim 1, characterized in that the operating state control means (130) operate the refrigerant compressor (12) in the first operating mode (B1) with an activation of all cylinder groups (42) and an adaptation of the rotational speed of the motor (60) to the first operating mode (B1).
  3. 3. Refrigerant compressor according to claim 1, characterized in that the operating state control means operate the refrigerant compressor (12) in at least one further operating mode (B), wherein at least one cylinder group (42) is deactivated and at least one cylinder group (42) is activated and is accompanied by an adaptation of the rotational speed of the motor (60) to said at least one further operating mode (B).
  4. 4. Refrigerant compressor according to claim 2, characterized in that the operating state control means operate the refrigerant compressor (12) in at least one further operating mode (B), wherein at least one cylinder group (42) is deactivated and at least one cylinder group (42) is activated and is accompanied by an adaptation of the rotational speed of the motor (60) to said at least one further operating mode (B).
  5. 5. A refrigerant compressor as claimed in claim 1, characterized in that the operating state control means (130) select one operating mode (B) in a partial power state which can be realized by a plurality of operating modes (B), which operating mode achieves the highest relative efficiency or the highest COP or the lowest electric power consumption of the motor (60) in this partial power state.
  6. 6. A refrigerant compressor as claimed in claim 4, characterized in that the operating state control means (130) select one operating mode (B) in a partial power state which can be realized by a plurality of operating modes (B), which operating mode achieves the highest relative efficiency or the highest COP or the lowest electric power consumption of the motor (60) in this partial power state.
  7. 7. Refrigerant compressor according to claim 5, characterized in that the operating state control means (130) determine the relative efficiency or COP or the electric power consumption of the motor (60) for the operating modes (B) respectively possible for realizing a partial power state, and select the operating mode (B) by comparing the determined relative efficiency or COP or electric power consumption.
  8. 8. A refrigerant compressor according to claim 6, characterized in that the operating state control means (130) determine the relative efficiency or COP or the electric power consumption of the motor (60) for the operating modes (B) respectively possible for realizing a partial power state, and select the operating mode (B) by comparing the determined relative efficiency or COP or electric power consumption.
  9. 9. Refrigerant compressor according to one of the claims 5 to 8, characterized in that the operating state control means (130) have stored data for the purpose of determining the relative efficiency or COP or electric power consumption for each operating mode (B).
  10. 10. Refrigerant compressor according to claim 5, characterized in that the relative efficiency or COP or the electric power consumption is determined by the operating state control means (130) by detecting the suction Pressure (PS) and/or the high Pressure (PH) at the refrigerant compressor (12).
  11. 11. Refrigerant compressor according to claim 9, characterized in that the relative efficiency or COP or the electric power consumption is determined by the operating state control means (130) by detecting the suction Pressure (PS) and/or the high Pressure (PH) at the refrigerant compressor (12).
  12. 12. A refrigerant compressor according to claim 5, characterized in that the operating state control means (130) take into account the refrigerant, the partial power state, the power consumption and/or the rotational speed of the motor (60) to determine the relative efficiency or COP or the electric power consumption.
  13. 13. Refrigerant compressor according to claim 11, characterized in that the operating state control means (130) take into account the refrigerant, the partial power state, the power consumption and/or the rotational speed of the motor (60) to determine the relative efficiency or COP or the electric power consumption.
  14. 14. Refrigerant compressor according to claim 1, characterized in that the operating state control means (130) continuously maintain a fixed predetermined deactivated and activated operating mode (B) with cylinder groups (42) in the operating mode of the first type to achieve the partial power state required by the power request signal (LA).
  15. 15. Refrigerant compressor according to claim 13, characterized in that the operating state control means (130) continuously maintain a fixed predetermined deactivated and activated operating mode (B) with cylinder groups (42) in the operating mode of the first type to achieve the partial power state required by the power request signal (LA).
  16. 16. Refrigerant compressor according to claim 1, characterized in that the operating state control means (130) operate the refrigerant compressor (12) in at least one operating mode (B) corresponding to the second type of operating mode by the clocked deactivation and activation of at least one cylinder group (42) within a defined Shift Interval (SI).
  17. 17. Refrigerant compressor according to claim 15, characterized in that the operating state control means (130) operate the refrigerant compressor (12) in at least one operating mode (B) corresponding to the second type of operating mode by the clocked deactivation and activation of at least one cylinder group (42) within a defined Shift Interval (SI).
  18. 18. Refrigerant compressor according to claim 1, characterized in that the activation and deactivation of each cylinder group (42) is performed by means of a mechanical power control unit (70) controlled by an operating state control device (130).
  19. 19. Refrigerant compressor according to claim 17, characterized in that the activation and deactivation of each cylinder group (42) is performed by means of a mechanical power control unit (70) controlled by an operating state control device (130).
  20. 20. A refrigerant compressor as claimed in claim 18, characterized in that a mechanical power control unit (70) is assigned to the cylinder head (58) of the cylinder bank (42).

Description

Refrigerant compressor Technical Field The invention relates to a refrigerant compressor for a refrigeration system, comprising a motor, at least two cylinder groups, each cylinder group having at least one cylinder unit each having a cylinder housing and a piston driven by the motor and capable of oscillating movement, and a cylinder head having an inlet chamber through which an inlet flow flows and an outlet chamber through which an outlet flow flows, and a mechanical power control unit for activating and deactivating the respective cylinder group in order to activate or deactivate the refrigerant discharge of the cylinder group. Background Such a refrigerant compressor is known from the prior art, for example from WO 2018/065071 A1. There is a problem in that these refrigerant compressors need to be operated as desirably as possible. Disclosure of Invention According to the invention, in the case of a refrigerant compressor of the initially mentioned type, this object is achieved in that the refrigerant compressor is capable of being operated in at least two different operating modes for operation in the respective partial power state, wherein each operating mode sets a different activation or deactivation of the cylinder group than the other operating modes, the refrigerant compressor comprises a frequency converter for rotational speed control of the electric motor, an operating state control is assigned to the refrigerant compressor, and the operating state control is adapted to the power request signal input to the operating state control in dependence on the power request signal and to operate the refrigerant compressor in a partial power state corresponding to the power request signal, the operating state control operating the refrigerant compressor in a selected operating mode from the at least two different operating modes and in a rotational speed of the electric motor adapted to the selected operating mode in order to achieve this partial power state. The solution according to the invention has the advantage that for the operation of the refrigerant compressor in the partial power states, at least two, preferably a plurality of operating modes are provided, with which the operating state control device can operate the refrigerant compressor optimally, wherein in each operating mode a plurality of partial power states can be achieved by changing, in particular steplessly, the rotational speed of the motor between a minimum rotational speed and a maximum rotational speed. In particular, it is thereby possible to achieve a maximum partial power state or a minimum partial power state by changing the rotational speed between a maximum rotational speed and a minimum rotational speed in the operating mode with the highest refrigerant discharge and in the operating mode with the lowest refrigerant discharge. Thus, a plurality of partial power states are provided by combining the selection of the operating mode with a particularly stepless selection of the rotational speed. The solution according to the invention is particularly advantageous when CO 2 is used as refrigerant. In the various operating modes, it is preferably provided that the operating state control device operates the refrigerant compressor in a first operating mode, which is associated with the activation of all cylinder groups and is adapted to the rotational speed, wherein the first operating mode is particularly suitable for operating states in a partial power range close to maximum power. In addition, it is preferably provided that the operating state control device operates the refrigerant compressor in at least one further operating mode, wherein at least one cylinder group is deactivated and at least one cylinder group is activated and the rotational speed of the accompanying motor is adapted to this operating mode. This means that in this case, for a partial power range which is particularly suitable for realizing a power request signal with medium or low power, an operating mode is used in which only a part of the cylinder groups are activated. In the solution according to the invention, it is particularly advantageous if the operating state control device selects an operating mode in a partial power state which can be realized by a plurality of operating modes, in which the highest relative efficiency or the highest COP or the lowest electrical power consumption of the electric machine is achieved. Such a selection may be achieved, for example, in that the operating state control means has stored information about the relative efficiency or COP or the electrical power consumption of the motor for each operating mode and for each partial power state. Alternatively, an advantageous solution provides for the operating state control to determine the relative efficiency or COP or the electrical power consumption of the electric machine for the operating modes respectively possible for realizing a partial power state, and to select